Tree Assessment - Strathfield Council Accurate Tree Assessment has been commissioned by Strathfield

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Text of Tree Assessment - Strathfield Council Accurate Tree Assessment has been commissioned by Strathfield

  • © Copyright Accurate Tree Assessment Ian Hills – Arborist ph: 0412 607 658 Project: Strathfield Square, Strathfield NSW September 2016

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    Tree Assessment

    Site Address: Strathfield Square, Strathfield NSW Client: Strathfield Council Date: September 2016 Prepared by Ian Hills - Associate Diploma Horticulture. Cert III Arboriculture Diploma Arboriculture P: 0412 607 658 F: (02) 4393 6590 E: info@accuratetreeassessment.com.au

    mailto:info@accuratetreeassessment.com.au

  • © Copyright Accurate Tree Assessment Ian Hills – Arborist ph: 0412 607 658 Project: Strathfield Square, Strathfield NSW September 2016

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    Table of contents

    1.0 Summary ....................................................................................................................................... 3

    Recommendations ............................................................................................................................... 3

    2.0 Disclaimer ...................................................................................................................................... 4

    3.0 Brief ............................................................................................................................................... 4

    4.0 Method........................................................................................................................................... 4

    4.1. Documents ............................................................................................................................... 4

    5.0 Site Conditions ............................................................................................................................... 5

    6.0 Tree Assessment ........................................................................................................................... 6

    Tree Assessment (cont) ....................................................................................................................... 7

    7.0 Tree Retention Value ..................................................................................................................... 8

    8.0 Discussion ..................................................................................................................................... 9

    9.0 Conclusions ................................................................................................................................. 12

    10.0 Recommendations ..................................................................................................................... 12

    11.0 Appendices ................................................................................................................................ 13

    11.1. Safe Useful Life Expectancy Categories ............................................................................... 13

    11.2 Tree Removal Concept Plan ................................................................................................. 14

    11.3 Calculating Tree retention Value ........................................................................................... 15

    11.4. References ........................................................................................................................... 15

    11.5 Qualifications – Ian Hills ........................................................................................................ 15

    Table of images

    Figure 1 Subject site (source Google maps) ........................................................................................ 5 Figure 2 Trees 1 and 2 Eucalyptus microcorys .................................................................................. 10 Figure 3 Trees 3 and 4 Platanus x acerifolius .................................................................................... 10 Figure 4 Trees 5 and 6 Platanus x acerifolius appear in average condition ........................................ 11 Figure 5 Tree 19 Robinia pseudoacacia ‘Frisia’ ................................................................................. 11

  • © Copyright Accurate Tree Assessment Ian Hills – Arborist ph: 0412 607 658 Project: Strathfield Square, Strathfield NSW September 2016

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    1.0 Summary

    Accurate Tree Assessment has been commissioned by Strathfield Council to provide an assessment of tree health and condition for twenty-two (22) trees growing in and around the Strathfield Square precinct. The site which is approximately 2860m² is completely paved to form roadways and areas of open- space and forms the hub of the Strathfield Town Centre; it is bounded by the Strathfield Railway Station to the North, Churchill Ave to the South, Strathfield Square to the East and The Boulevarde to the West.

    Conclusions

    The subject trees appear in various stages of decline associated with the lack of adequate root- zone volume which restricts water percolation and gaseous exchange leading to dieback of branches and poor form, and are not suited to retention. The increased maintenance requirement is not sustainable and places a burden on Council resources that could be more appropriately used elsewhere. The replacement of Tree 19 will require consultation with the Community to establish a fitting memorial to the lives lost in 1991. Redevelopment of the area should include the provision of replacement plantings of species better suited to the location, and must include adequate provision for the root-zone of those trees.

    Recommendations

    That the subject trees are removed and replaced in conjunction with the redevelopment of Strathfield Square by the Council. That the memorial Tree 19 Robinia pseudoacacia ‘Frisia’ is replaced in consultation with the community. That the replacement plantings are provided with adequate root-zone volume by using sub-surface planting chambers or gap-graded structural soils and permeable surface treatments.

  • © Copyright Accurate Tree Assessment Ian Hills – Arborist ph: 0412 607 658 Project: Strathfield Square, Strathfield NSW September 2016

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    2.0 Disclaimer

    This report is to be read and considered in its entirety. The subject trees were inspected from the ground using Visual Tree Assessment methodology, no aerial investigations; underground or internal investigations were undertaken. It is the responsibility of the client to implement all recommendations contained in this report. The assessment is made having regard for the prevailing site conditions; and does not account for the effects that extreme weather events may have on trees. Photographs used in this report are originals taken at the time of inspection and are not altered in anyway. Information contained in this report reflects the condition of the trees at the time of the inspection. As trees are living organisms their condition will change over time, there is no guarantee that problems or deficiencies of the subject trees may not arise in the future. It must be accepted that living in close proximity to trees involves some level of risk. This report is for the use of the client Strathfield Council, to assist in determining tree management options in conjunction with the proposed re-development of the area; distribution to others is not permitted except with the express permission of the author, Ian Hills.

    3.0 Brief

    Accurate Tree Assessment has been commissioned by Strathfield Council to provide an assessment of tree health and condition for twenty-two (22) trees growing in and around the Strathfield Square precinct.

    4.0 Method

    An inspection of the subject trees was conducted from the ground on 21 September 2016. The assessment of the trees was made using a combination of both the relevant elements of Visual Tree Assessment (VTA) procedure (Matheny & Clark, 1994), (Mattheck & Breloer, 2004) with the aid of a Visual tree assessment form developed by International Society of Arborists in accordance with industry best practice. Tree height was determined using Silva Clinomaster™ clinometer. Tree canopy spread was determined using a 30 metre retractable tape. The DBH was determined using a Million™ 12 tree diameter tape. Sounding of the trunks was carried out using a Thor®710 soft faced hammer. The canopy structure was examined using binoculars from ground level. Trees were identified and each tree allocated a reference number which has been marked on the Tree Removal Concept Plan. 4.1. Documents

    Leon Limberiou, Council’s Tree Management Officer has provided a copy of the Tree Removal Concept Plan prepared by Strathfield Council dated 16 September 2016, which has been used as a reference to this report. (Appendix 11.2)

  • © Copyright Accurate Tree Assessment Ian Hills – Arborist ph: 0412 607 658 Project: Strathfield Square, Strathfield NSW September 2016

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    5.0 Site Conditions

    The site which is approximately 2860m² is completely paved to form roadways and areas of open- space and forms the hub of the Strathfield Town Centre; it is bounded by the Strathfield Railway Station to the North, Churchill Ave to the South, Strathfield Square to the East and The Boulevarde to the West. The subject trees provide shade and some relief from the hard landscaping that dominates the precinct which is frequented by commuters and patrons of